During which period did rodents, marsupials, primates, and hoofed animals first appear in north america

For the answer to the question above, I believe the answer is "Tertiary Period"
The Tertiary Period marks the beginning of Cenozoic Era. It only began 65M years ago and lasted more than 63M years, until 1.8 million years ago. I hope my answer helped you. Have a nice day!

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.